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Define pg_attribute_cold and pg_attribute_hot macros

For compilers supporting __has_attribute and __has_attribute (hot/cold).__has_attribute is supported on gcc >= 5, clang >= 2.9 and icc >= 17.A followup commit will implement some usages of these macros.Author: David RowleyReviewed-by: Andres Freund, Peter EisentrautDiscussion:https://postgr.es/m/CAApHDvrVpasrEzLL2er7p9iwZFZ%3DJj6WisePcFeunwfrV0js_A%40mail.gmail.com

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src/include
- c.h

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`‎src/include/c.h‎`

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Original file line number	Diff line number	Diff line change
`@@ -191,6 +191,22 @@`
`191`	`191`	`#definepg_noinline`
`192`	`192`	`#endif`
`193`	`193`
	`194`	`+/*`
	`195`	`+ * Marking certain functions as "hot" or "cold" can be useful to assist the`
	`196`	`+ * compiler in arranging the assembly code in a more efficient way.`
	`197`	`+ */`
	`198`	`+#if defined(__has_attribute)&&__has_attribute (cold)`
	`199`	`+#definepg_attribute_cold __attribute__((cold))`
	`200`	`+#else`
	`201`	`+#definepg_attribute_cold`
	`202`	`+#endif`
	`203`	`+`
	`204`	`+#if defined(__has_attribute)&&__has_attribute (hot)`
	`205`	`+#definepg_attribute_hot __attribute__((hot))`
	`206`	`+#else`
	`207`	`+#definepg_attribute_hot`
	`208`	`+#endif`
	`209`	`+`
`194`	`210`	`/*`
`195`	`211`	`* Mark a point as unreachable in a portable fashion. This should preferably`
`196`	`212`	`* be something that the compiler understands, to aid code generation.`

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Commit697e1d0

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`‎src/include/c.h‎`

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