MIPS: fix-up after r11344

Removed a constant now duplicated by r11344 (7c41cf72).
This fixes compilation on MIPS (with the other submitted patches applied).

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10108023
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11365 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/constants-mips.h

@@ -788,11 +788,6 @@ const int kBArgsSlotsSize = 0 * Instruction::kInstrSize;
 
 const int kBranchReturnOffset = 2 * Instruction::kInstrSize;
 
-const int kDoubleAlignmentBits = 3;
-const int kDoubleAlignment = (1 << kDoubleAlignmentBits);
-const int kDoubleAlignmentMask = kDoubleAlignment - 1;
-
-
 } }   // namespace v8::internal
 
 #endif    // #ifndef V8_MIPS_CONSTANTS_H_