test: adjust for Windows file extensions

Windows tools have the `.exe` suffix which may or may not be present.
Adjust the test to account for that.

Author: compnerd

test/Driver/profiling.swift

@@ -41,7 +41,7 @@
 // watchOS: {{(bin/)?ld(.exe)?"? }}
 // watchOS: lib{{(\\\\|/)}}swift{{(\\\\|/)}}clang{{(\\\\|/)}}lib{{(\\\\|/)}}darwin{{(\\\\|/)}}libclang_rt.profile_watchos.a
 
-// watchOS_SIM: {{(bin/)?ld"? }}
+// watchOS_SIM: {{(bin/)?ld(.exe)?"? }}
 // watchOS_SIM: lib{{(\\\\|/)}}swift{{(\\\\|/)}}clang{{(\\\\|/)}}lib{{(\\\\|/)}}darwin{{(\\\\|/)}}libclang_rt.profile_watchossim.a
 
 // LINUX: clang++{{(\.exe)?"? }}