x86-64: Remove .file directive from snapshot source

Since snapshot() is implemented in assembly code, .file directive should
be removed.  Otherwise, debugger can't find the snapshot source.

	* gcc.target/x86_64/abi/asm-support-darwin.s: Remove .file
	directive.
	* gcc.target/x86_64/abi/asm-support.S: Likewise.

From-SVN: r267450

gcc/testsuite/ChangeLog

+2018-12-28  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gcc.target/x86_64/abi/asm-support-darwin.s: Remove .file
+	directive.
+	* gcc.target/x86_64/abi/asm-support.S: Likewise.
+
 2018-12-27  Jan Hubicka  <hubicka@ucw.cz>
 
 	* g++.dg/ipa/devirt-53.C: New testcase.

gcc/testsuite/gcc.target/x86_64/abi/asm-support-darwin.s

-	.file	"snapshot.S"
 	.text
 	.p2align 4,,15
 .globl _snapshot

gcc/testsuite/gcc.target/x86_64/abi/asm-support.S

-	.file	"snapshot.S"
 #ifdef __AVX__
 	.sse_check none
 #endif