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Avoid too-large shift on 32-bit Windows.

Apparently, shifts greater than or equal to the width of the typeare undefined, and can surprisingly produce a non-zero value.Amit Kapila, with a comment by me.

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src/backend/storage/ipc
- dsm_impl.c

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+11

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lines changed

`‎src/backend/storage/ipc/dsm_impl.c‎`

Lines changed: 11 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -673,8 +673,17 @@ dsm_impl_windows(dsm_op op, dsm_handle handle, Size request_size,`
`673`	`673`	`/* Create new segment or open an existing one for attach. */`
`674`	`674`	`if (op==DSM_OP_CREATE)`
`675`	`675`	`{`
`676`		`-DWORDsize_high= (DWORD) (request_size >>32);`
`677`		`-DWORDsize_low= (DWORD)request_size;`
	`676`	`+DWORDsize_high;`
	`677`	`+DWORDsize_low;`
	`678`	`+`
	`679`	`+/* Shifts >= the width of the type are undefined. */`
	`680`	`+#ifdef_WIN64`
	`681`	`+size_high=request_size >>32;`
	`682`	`+#else`
	`683`	`+size_high=0;`
	`684`	`+#endif`
	`685`	`+size_low= (DWORD)request_size;`
	`686`	`+`
`678`	`687`	`hmap=CreateFileMapping(INVALID_HANDLE_VALUE,/* Use the pagefile */`
`679`	`688`	`NULL,/* Default security attrs */`
`680`	`689`	`PAGE_READWRITE,/* Memory is read/write */`

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Commit343bb13

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`‎src/backend/storage/ipc/dsm_impl.c‎`

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