context: Restore -fprofile-update=atomic for GCC PGO

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

Author: ikeydoherty

ypkg2/ypkgcontext.py

@@ -46,7 +46,8 @@
 UNROLL_LOOPS_FLAGS = "-funroll-loops"
 
 # GCC PGO flags
-PGO_GEN_FLAGS = "-fprofile-generate -fprofile-dir=\"{}\" "
+PGO_GEN_FLAGS = "-fprofile-generate -fprofile-dir=\"{}\" " \
+                "-fprofile-update=atomic"
 PGO_USE_FLAGS = "-fprofile-use -fprofile-dir=\"{}\" -fprofile-correction"
 
 # Clang can handle parameters to the args unlike GCC