[x64] Tweaking kMaxSizeEarlyOpt value to recover SunSpider/3d-cube.

With the IC-less global variables accesses the size of the Rotate* functions became small enough to be immediately optimized by Crankshaft which in turn tanked SunSpider/3d-cube.

BUG=chromium:531338
LOG=N

Review URL: https://codereview.chromium.org/1356603005

Cr-Commit-Position: refs/heads/master@{#30861}

src/full-codegen/full-codegen.h

@@ -76,7 +76,7 @@ class FullCodeGenerator: public AstVisitor {
 #if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
   static const int kCodeSizeMultiplier = 105;
 #elif V8_TARGET_ARCH_X64
-  static const int kCodeSizeMultiplier = 170;
+  static const int kCodeSizeMultiplier = 165;
 #elif V8_TARGET_ARCH_ARM
   static const int kCodeSizeMultiplier = 149;
 #elif V8_TARGET_ARCH_ARM64