PPC: Disable gcc generation of fmadd/fmsub in cctests.

test/cctest/cctest.gyp

Index: test/cctest/cctest.gyp
diff --git a/test/cctest/cctest.gyp b/test/cctest/cctest.gyp
index 9ace116d1b8547c22f75709cf5877a5ed39c570a..0934074ca434bd531f31739fad92a8aa23c0d534 100644
--- a/test/cctest/cctest.gyp
+++ b/test/cctest/cctest.gyp
@@ -279,6 +279,11 @@
             },
           },
         }],
+        ['v8_target_arch=="ppc" or v8_target_arch=="ppc64"', {
+          # disable fmadd/fmsub so that expected results match generated code in
+          # RunFloat64MulAndFloat64Add1 and friends.
+          'cflags': ['-ffp-contract=off'],
+        }],
         ['OS=="aix"', {
           'ldflags': [ '-Wl,-bbigtoc' ],
         }],