PPC: Set CodeRange constants correctly for PPC Linux

The OS page size for PPC linux is 64KB. The page size for
paged spaces on PPC linux is set to 4MB. kCodeRangeAreaAlignment
is set to OS page size(64KB) and kMinimumCodeRangeSize is set to the
size of 3 pages (12MB). This issue was exposed with testcase
test-spaces/Regress3540 which used kMinimumCodeRangeSize.

R=jochen@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2187833002
Cr-Commit-Position: refs/heads/master@{#38180}

src/globals.h

@@ -151,6 +151,9 @@ const bool kRequiresCodeRange = true;
 // region. Used only for large object space.
 const size_t kMaximalCodeRangeSize = 256 * MB;
 const size_t kCodeRangeAreaAlignment = 256 * MB;
+#elif V8_HOST_ARCH_PPC && V8_TARGET_ARCH_PPC && V8_OS_LINUX
+const size_t kMaximalCodeRangeSize = 512 * MB;
+const size_t kCodeRangeAreaAlignment = 64 * KB;  // OS page on PPC Linux
 #else
 const size_t kMaximalCodeRangeSize = 512 * MB;
 const size_t kCodeRangeAreaAlignment = 4 * KB;  // OS page.
@@ -158,6 +161,10 @@ 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;
@@ -171,15 +178,19 @@ const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;
 const bool kRequiresCodeRange = true;
 const size_t kMaximalCodeRangeSize = 256 * MB;
 const size_t kMinimumCodeRangeSize = 3 * MB;
-const size_t kReservedCodeRangePages = 0;
 const size_t kCodeRangeAreaAlignment = 4 * KB;  // OS page.
+#elif V8_HOST_ARCH_PPC && V8_TARGET_ARCH_PPC && V8_OS_LINUX
+const bool kRequiresCodeRange = false;
+const size_t kMaximalCodeRangeSize = 0 * MB;
+const size_t kMinimumCodeRangeSize = 0 * MB;
+const size_t kCodeRangeAreaAlignment = 64 * KB;  // OS page on PPC Linux
 #else
 const bool kRequiresCodeRange = false;
 const size_t kMaximalCodeRangeSize = 0 * MB;
 const size_t kMinimumCodeRangeSize = 0 * MB;
-const size_t kReservedCodeRangePages = 0;
 const size_t kCodeRangeAreaAlignment = 4 * KB;  // OS page.
 #endif
+const size_t kReservedCodeRangePages = 0;
 #endif
 
 // The external allocation limit should be below 256 MB on all architectures