VM: Fix FP math discrepancies by adding -mfpmath=sse to 32-bit simulator and cross host builds.

tools/gyp/configurations_make.gypi

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'dart_debug_optimization_level%': '2',
   },
   'target_defaults': {
     'configurations': {
@@ skipping 53 matching lines @@
               # functions unless told otherwise:
               # (note this flag only works on recent GCC versions.)
               '-mno-omit-leaf-frame-pointer',
             ],
           }],
         ],
       },
 
       'Dart_Linux_simarm_Base': {
         'abstract': 1,
-        'cflags': [ '-O3', '-m32', '-msse2' ],
+        'cflags': [ '-O3', '-m32', '-msse2', '-mfpmath=sse' ],
         'ldflags': [ '-m32', ],
       },
 
       'Dart_Linux_simarmv5te_Base': {
         'abstract': 1,
-        'cflags': [ '-O3', '-m32', '-msse2' ],
+        'cflags': [ '-O3', '-m32', '-msse2', '-mfpmath=sse' ],
         'ldflags': [ '-m32', ],
       },
 
       'Dart_Linux_simarm64_Base': {
         'abstract': 1,
-        'cflags': [ '-O3', '-m64', '-msse2' ],
+        'cflags': [ '-O3', '-m64', '-msse2', '-mfpmath=sse' ],
         'ldflags': [ '-m64', ],
       },
 
       # ARM cross-build
       'Dart_Linux_xarm_Base': {
         'abstract': 1,
         'target_conditions': [
         ['_toolset=="target"', {
           'cflags': [
             '-marm',
             '-mfpu=vfp',
             '-Wno-psabi', # suppresses va_list warning
             '-fno-strict-overflow',
           ],
         }],
         ['_toolset=="host"', {
-          'cflags': ['-m32', '-msse2'],
+          'cflags': ['-m32', '-msse2', '-mfpmath=sse' ],
           'ldflags': ['-m32'],
         }]]
       },
 
       # ARM native build
       'Dart_Linux_arm_Base': {
         'abstract': 1,
         'cflags': [
           '-marm',
           '-mfpu=vfp',
@@ skipping 10 matching lines @@
           'cflags': [
             '-mthumb',
             '-mlong-calls',
             '-march=armv5te',
             '-mfloat-abi=soft',
             '-Wno-psabi', # suppresses va_list warning
             '-fno-strict-overflow',
           ],
         }],
         ['_toolset=="host"', {
-          'cflags': ['-m32', '-msse2'],
+          'cflags': ['-m32', '-msse2', '-mfpmath=sse' ],
           'ldflags': ['-m32'],
         }]]
       },
 
       # ARMv5 native build
       'Dart_Linux_armv5te_Base': {
         'abstract': 1,
         'cflags': [
           '-mthumb',
           '-mlong-calls',
@@ skipping 18 matching lines @@
       },
 
       # ARM64 native build
       'Dart_Linux_arm64_Base': {
         'abstract': 1,
         'cflags': [ '-O3', ],
       },
 
       'Dart_Linux_simmips_Base': {
         'abstract': 1,
-        'cflags': [ '-O3', '-m32', '-msse2' ],
+        'cflags': [ '-O3', '-m32', '-msse2', '-mfpmath=sse' ],
         'ldflags': [ '-m32', ],
       },
 
       # MIPS cross-build
       'Dart_Linux_xmips_Base': {
         'abstract': 1,
         'target_conditions': [
           ['_toolset=="target"', {
             'cflags': [
               '-EL',
               '-march=mips32',
               '-mhard-float',
               '-fno-strict-overflow',
             ],
             'ldflags': [
               '-EL',
             ],
           }],
           ['_toolset=="host"',{
-            'cflags': [ '-O3', '-m32', '-msse2' ],
+            'cflags': [ '-O3', '-m32', '-msse2', '-mfpmath=sse' ],
             'ldflags': [ '-m32' ],
         }]]
       },
 
       # MIPS native build
       'Dart_Linux_mips_Base': {
         'abstract': 1,
         'cflags': [
           '-march=mips32',
           '-mhard-float',
@@ skipping 30 matching lines @@
             ],
           }],
         ],
         'cflags': [
           '-O3',
         ],
       },
     },
   },
 }