Massive check in. This changes the "-fast" flag to "-O#" in llc. If you want to

use the old behavior, the flag is -O0. This change allows for finer-grained
control over which optimizations are run at different -O levels.

Most of this work was pretty mechanical. The majority of the fixes came from
verifying that a "fast" variable wasn't used anymore. The JIT still uses a
"Fast" flag. I'm not 100% sure if it's necessary to change it there...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70270 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86.h

@@ -25,7 +25,7 @@ class raw_ostream;
 /// createX86ISelDag - This pass converts a legalized DAG into a 
 /// X86-specific DAG, ready for instruction scheduling.
 ///
-FunctionPass *createX86ISelDag(X86TargetMachine &TM, bool Fast);
+FunctionPass *createX86ISelDag(X86TargetMachine &TM, unsigned OptSize);
 
 /// createX86FloatingPointStackifierPass - This function returns a pass which
 /// converts floating point register references and pseudo instructions into
@@ -44,7 +44,7 @@ FunctionPass *createX87FPRegKillInserterPass();
 ///
 FunctionPass *createX86CodePrinterPass(raw_ostream &o,
                                        X86TargetMachine &tm,
-                                       bool fast, bool Verbose);
+                                       unsigned OptLevel, bool Verbose);
 
 /// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
 /// to the specified MCE object.