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Add pg_attribute_always_inline.

Sometimes it is useful to be able to insist that the compiler inline afunction that its normal cost analysis would not normally choose to inline.This can be useful for instantiating different variants of a function thatremove branches of code by constant folding.Author: Thomas MunroReviewed-By: Andres FreundDiscussion:https://postgr.es/m/CAEepm=09rr65VN+cAV5FgyM_z=D77Xy8Fuc9CDDDYbq3pQUezg@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -146,6 +146,16 @@`
`146`	`146`	`#definepg_attribute_noreturn()`
`147`	`147`	`#endif`
`148`	`148`
	`149`	`+/* GCC, Sunpro and XLC support always_inline via __attribute__ */`
	`150`	`+#if defined(__GNUC__)`
	`151`	`+#definepg_attribute_always_inline __attribute__((always_inline))`
	`152`	`+/* msvc via a special keyword */`
	`153`	`+#elif defined(_MSC_VER)`
	`154`	`+#definepg_attribute_always_inline __forceinline`
	`155`	`+#else`
	`156`	`+#definepg_attribute_always_inline`
	`157`	`+#endif`
	`158`	`+`
`149`	`159`	`/*`
`150`	`160`	`* Forcing a function not to be inlined can be useful if it's the slow path of`
`151`	`161`	`* a performance-critical function, or should be visible in profiles to allow`

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`‎src/include/c.h`

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