Implement the X86 Subtarget.

This consolidates the checks for target triple, and setting options based
on target triple into one place.  This allows us to convert the asm printer
and isel over from being littered with "forDarwin", "forCygwin", etc. into
just having the appropriate flags for each subtarget feature controlling
the code for that feature.

This patch also implements indirect external and weak references in the
X86 pattern isel, for darwin.  Next up is to convert over the asm printers
to use this new interface.

llvm-svn: 22389

interface.

llvm-svn: 22282

* Convert tabs to spaces

llvm-svn: 21426

hold your nose!)

llvm-svn: 17869

llvm-svn: 14745

llvm-svn: 13952

llvm-svn: 12252

(16) into certain areas of the SPARC V9 back-end. I'm fairly sure the US IIIi's
dcache has 32-byte lines, so I'm not sure where the 16 came from. However, in
the interest of not breaking things any more than they already are, I'm going
to leave the constant alone.

llvm-svn: 12043

implementation from the TargetMachine directly.

llvm-svn: 10636

llvm-svn: 10629

llvm-svn: 10542

namespacification.

llvm-svn: 10430

llvm-svn: 9903

llvm-svn: 9321

llvm-svn: 9295

llvm-svn: 9202

llvm-svn: 8312

llvm-svn: 8132

 FunctionPassManager, to support function-at-a-time compilation and
 emission of code.

llvm-svn: 7821

 (non-working) of llc guts for X86, and add a prototype for it.

llvm-svn: 6779

llvm-svn: 5204

Rename MachineCacheInfo to TargetCacheInfo

llvm-svn: 5203

llvm-svn: 5199

llvm-svn: 5189

Changes to allow for a configurable target machine that allows big endian and/or long pointer operation

llvm-svn: 5131

llvm-svn: 4871

llvm-svn: 4866

llvm-svn: 4437

llvm-svn: 4421