Commite653c71

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Update comment about __sync_lock_test_and_set() bug.

State the earliest known fixed version, so we can someday judge theworkaround to be obsolete.

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Original file line number	Diff line number	Diff line change
`@@ -89,7 +89,7 @@`
`89`	`89`	`/*`
`90`	`90`	`* gcc or compatible, including clang and icc. Exclude xlc. The ppc64le "IBM`
`91`	`91`	`* XL C/C++ for Linux, V13.1.2" emulates gcc, but __sync_lock_test_and_set()`
`92`		`- * of one-byte types elicits SIGSEGV.`
	`92`	`+ * of one-byte types elicits SIGSEGV. That bug was gone by V13.1.5 (2016-12).`
`93`	`93`	`*/`
`94`	`94`	`#if (defined(__GNUC__)\|\| defined(__INTEL_COMPILER))&& !(defined(__IBMC__)\|\| defined(__IBMCPP__))`
`95`	`95`	`#include"port/atomics/generic-gcc.h"`

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