Avoid static initializers in assember-arm.h.

Patch by joth@chromium.org.

BUG=v8:1784
Review URL: http://codereview.chromium.org/8367001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9732 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/assembler-arm.h

@@ -304,9 +304,9 @@ const DwVfpRegister d14 = { 14 };
 const DwVfpRegister d15 = { 15 };
 
 // Aliases for double registers.
-const DwVfpRegister kFirstCalleeSavedDoubleReg = d8;
-const DwVfpRegister kLastCalleeSavedDoubleReg = d15;
-const DwVfpRegister kDoubleRegZero = d14;
+static const DwVfpRegister& kFirstCalleeSavedDoubleReg = d8;
+static const DwVfpRegister& kLastCalleeSavedDoubleReg = d15;
+static const DwVfpRegister& kDoubleRegZero = d14;
 
 
 // Coprocessor register