Bug 412210. SpiderMonkey faster at -O2 with msvc. r/a=brendan

js/src/Makefile.in

@@ -56,7 +56,7 @@ ifeq ($(OS_ARCH),SunOS)
 MODULE_OPTIMIZE_FLAGS = -O
 endif
 ifeq ($(OS_ARCH),WINNT)
-MODULE_OPTIMIZE_FLAGS = -O1
+MODULE_OPTIMIZE_FLAGS = -O2 -GL
 endif
 endif
 

js/src/config.mk

@@ -118,7 +118,8 @@ endif
 
 ifdef BUILD_OPT
 ifdef USE_MSVC
-OPTIMIZER  = -O1
+OPTIMIZER  = -O2 -GL
+LDFLAGS    += -LTCG
 else
 OPTIMIZER  = -Os
 endif