Subzero. Removes X8664_STACK_HACK from the crosstests.

crosstest/xdefs.h

 //===- subzero/crosstest/xdefs.h - Definitions for the crosstests. --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Defines the int64 and uint64 types to avoid link-time errors when compiling
 // the crosstests in LP64.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_CROSSTEST_XDEFS_H_
 #define SUBZERO_CROSSTEST_XDEFS_H_
 
 typedef unsigned int int32;
 typedef unsigned int uint32;
 typedef long long int64;
 typedef unsigned long long uint64;
 typedef unsigned int SizeT;
 
-#ifdef X8664_STACK_HACK
-
-// the X86_STACK_HACK is an intrusive way of getting the crosstests to run in
-// x86_64 LP64 even with an ILP32 model. This hack allocates a new stack for
-// running the tests in the low 4GB of the address space.
-
-#ifdef __cplusplus
-#define XTEST_EXTERN extern "C"
-#else // !defined(__cplusplus)
-#define XTEST_EXTERN extern
-#endif // __cplusplus
-
-/// xAllocStack allocates the memory chunk [StackEnd - Size - 1, StackEnd). It
-/// requires StackEnd to be less than 32-bits long. Conversely, xDeallocStack
-/// frees that memory chunk.
-/// {@
-XTEST_EXTERN unsigned char *xAllocStack(uint64 StackEnd, uint32 Size);
-XTEST_EXTERN void xDeallocStack(uint64 StackEnd, uint32 Size);
-/// @}
-
-// wrapped_main is invoked by the x86-64 stack hack main. We declare a prototype
-// so the compiler (and not the linker) can yell if a test's wrapped_main
-// prototype does not match what we want.
-XTEST_EXTERN int wrapped_main(int argc, char *argv[]);
-
-#undef XTEST_EXTERN
-
-#endif // X8664_STACK_HACK
-
 #endif // SUBZERO_CROSSTEST_XDEFS_H_