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Change various Gin*Is* macros to return 0/1.

Returning the direct result of bit arithmetic, in a macro intended to beused in a boolean manner, can be problematic if the return value isstored in a variable of type 'bool'. If bool is implemented using C99's_Bool, that can lead to comparison failures if the variable is thencompared again with the expression (see ginStepRight() for an examplethat fails), as _Bool forces the result to be 0/1. That happens in someconfigurations of newer MSVC compilers. It's also problematic whenstoring the result of such an expression in a narrower type.Several gin macros have been declared in that style since gin's initialcommit in8a3631f.There's a lot more macros like this, but this is the only one causingregression test failures; and I don't want to commit and backpatch alarger patch with lots of conflicts just before the next set of minorreleases.Discussion: 20150811154237.GD17575@awork2.anarazel.deBackpatch: All supported branches

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src/include/access
- gin_private.h

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`‎src/include/access/gin_private.h`

Lines changed: 8 additions & 8 deletions

Original file line number	Diff line number	Diff line change
`@@ -112,22 +112,22 @@ typedef struct GinMetaPageData`
`112`	`112`	`*/`
`113`	`113`	`#defineGinPageGetOpaque(page) ( (GinPageOpaque) PageGetSpecialPointer(page) )`
`114`	`114`
`115`		`-#defineGinPageIsLeaf(page) ( GinPageGetOpaque(page)->flags & GIN_LEAF )`
	`115`	`+#defineGinPageIsLeaf(page) ((GinPageGetOpaque(page)->flags & GIN_LEAF) != 0 )`
`116`	`116`	`#defineGinPageSetLeaf(page) ( GinPageGetOpaque(page)->flags \|= GIN_LEAF )`
`117`	`117`	`#defineGinPageSetNonLeaf(page) ( GinPageGetOpaque(page)->flags &= ~GIN_LEAF )`
`118`		`-#defineGinPageIsData(page) ( GinPageGetOpaque(page)->flags & GIN_DATA )`
	`118`	`+#defineGinPageIsData(page) ((GinPageGetOpaque(page)->flags & GIN_DATA) != 0 )`
`119`	`119`	`#defineGinPageSetData(page) ( GinPageGetOpaque(page)->flags \|= GIN_DATA )`
`120`		`-#defineGinPageIsList(page) ( GinPageGetOpaque(page)->flags & GIN_LIST )`
	`120`	`+#defineGinPageIsList(page) ((GinPageGetOpaque(page)->flags & GIN_LIST) != 0 )`
`121`	`121`	`#defineGinPageSetList(page) ( GinPageGetOpaque(page)->flags \|= GIN_LIST )`
`122`		`-#defineGinPageHasFullRow(page) ( GinPageGetOpaque(page)->flags & GIN_LIST_FULLROW )`
	`122`	`+#defineGinPageHasFullRow(page) ((GinPageGetOpaque(page)->flags & GIN_LIST_FULLROW) != 0 )`
`123`	`123`	`#defineGinPageSetFullRow(page) ( GinPageGetOpaque(page)->flags \|= GIN_LIST_FULLROW )`
`124`		`-#defineGinPageIsCompressed(page) ( GinPageGetOpaque(page)->flags & GIN_COMPRESSED )`
	`124`	`+#defineGinPageIsCompressed(page) ((GinPageGetOpaque(page)->flags & GIN_COMPRESSED) != 0 )`
`125`	`125`	`#defineGinPageSetCompressed(page) ( GinPageGetOpaque(page)->flags \|= GIN_COMPRESSED )`
`126`	`126`
`127`		`-#defineGinPageIsDeleted(page) ( GinPageGetOpaque(page)->flags & GIN_DELETED)`
	`127`	`+#defineGinPageIsDeleted(page) ((GinPageGetOpaque(page)->flags & GIN_DELETED) != 0)`
`128`	`128`	`#defineGinPageSetDeleted(page) ( GinPageGetOpaque(page)->flags \|= GIN_DELETED)`
`129`	`129`	`#defineGinPageSetNonDeleted(page) ( GinPageGetOpaque(page)->flags &= ~GIN_DELETED)`
`130`		`-#defineGinPageIsIncompleteSplit(page) ( GinPageGetOpaque(page)->flags & GIN_INCOMPLETE_SPLIT)`
	`130`	`+#defineGinPageIsIncompleteSplit(page) ((GinPageGetOpaque(page)->flags & GIN_INCOMPLETE_SPLIT) != 0)`
`131`	`131`
`132`	`132`	`#defineGinPageRightMost(page) ( GinPageGetOpaque(page)->rightlink == InvalidBlockNumber)`
`133`	`133`
`@@ -224,7 +224,7 @@ typedef signed char GinNullCategory;`
`224`	`224`	`#defineGinGetPostingOffset(itup)(GinItemPointerGetBlockNumber(&(itup)->t_tid) & (~GIN_ITUP_COMPRESSED))`
`225`	`225`	`#defineGinSetPostingOffset(itup,n) ItemPointerSetBlockNumber(&(itup)->t_tid,(n)\|GIN_ITUP_COMPRESSED)`
`226`	`226`	`#defineGinGetPosting(itup)((Pointer) ((char*)(itup) + GinGetPostingOffset(itup)))`
`227`		`-#defineGinItupIsCompressed(itup)(GinItemPointerGetBlockNumber(&(itup)->t_tid) & GIN_ITUP_COMPRESSED)`
	`227`	`+#defineGinItupIsCompressed(itup)((GinItemPointerGetBlockNumber(&(itup)->t_tid) & GIN_ITUP_COMPRESSED) != 0)`
`228`	`228`
`229`	`229`	`/*`
`230`	`230`	`* Maximum size of an item on entry tree page. Make sure that we fit at least`

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`‎src/include/access/gin_private.h`

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