PPC: fixed the 32bit build

src/base/build_config.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BASE_BUILD_CONFIG_H_
 #define V8_BASE_BUILD_CONFIG_H_
 
 #include "include/v8config.h"
 
 // Processor architecture detection.  For more info on what's defined, see:
@@ skipping 17 matching lines @@
 #define V8_HOST_ARCH_ARM 1
 #define V8_HOST_ARCH_32_BIT 1
 #elif defined(__mips64)
 #define V8_HOST_ARCH_MIPS64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__MIPSEB__) || defined(__MIPSEL__)
 #define V8_HOST_ARCH_MIPS 1
 #define V8_HOST_ARCH_32_BIT 1
 #elif defined(__PPC__) || defined(_ARCH_PPC)
 #define V8_HOST_ARCH_PPC 1
-#if defined(__PPC64__) || defined(_ARCH_PPC64) || defined(_ARCH_PPCGR)
+#if defined(__PPC64__) || defined(_ARCH_PPC64)
 #define V8_HOST_ARCH_64_BIT 1
 #else
 #define V8_HOST_ARCH_32_BIT 1
 #endif
 #elif defined(__s390__) || defined(__s390x__)
 #define V8_HOST_ARCH_S390 1
 #if defined(__s390x__)
 #define V8_HOST_ARCH_64_BIT 1
 #else
 #define V8_HOST_ARCH_32_BIT 1
@@ skipping 155 matching lines @@
 #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK 1
 #else
 #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK 0
 #endif
 
 // Number of bits to represent the page size for paged spaces. The value of 20
 // gives 1Mb bytes per page.
 const int kPageSizeBits = 19;
 
 #endif  // V8_BASE_BUILD_CONFIG_H_