PPC: [heap] Switch to 500k pages

To keep it consistent with other platforms.

R=mlippautz@chromium.org, ulan@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2384553003
Cr-Commit-Position: refs/heads/master@{#39954}

src/base/build_config.h

@@ -204,11 +204,6 @@
 
 // Number of bits to represent the page size for paged spaces. The value of 20
 // gives 1Mb bytes per page.
-#if V8_HOST_ARCH_PPC && V8_TARGET_ARCH_PPC && V8_OS_LINUX
-// Bump up for Power Linux due to larger (64K) page size.
-const int kPageSizeBits = 22;
-#else
 const int kPageSizeBits = 19;
-#endif
 
 #endif  // V8_BASE_BUILD_CONFIG_H_

src/globals.h

@@ -187,10 +187,6 @@ const size_t kCodeRangeAreaAlignment = 4 * KB;  // OS page.
 #if V8_OS_WIN
 const size_t kMinimumCodeRangeSize = 4 * MB;
 const size_t kReservedCodeRangePages = 1;
-// On PPC Linux PageSize is 4MB
-#elif V8_HOST_ARCH_PPC && V8_TARGET_ARCH_PPC && V8_OS_LINUX
-const size_t kMinimumCodeRangeSize = 12 * MB;
-const size_t kReservedCodeRangePages = 0;
 #else
 const size_t kMinimumCodeRangeSize = 3 * MB;
 const size_t kReservedCodeRangePages = 0;