cpu, arch: Replace the CCReg type with RegVal.

Most architectures weren't using the CCReg type, and in x86 and arm
it was already a uint64_t.

Change-Id: I0b3d5e690e6b31db6f2627f449c89bde0f6750a6
Reviewed-on: https://gem5-review.googlesource.com/c/14515
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/cpu/simple/exec_context.hh

@@ -60,7 +60,6 @@ class BaseSimpleCPU;
 
 class SimpleExecContext : public ExecContext {
   protected:
-    typedef TheISA::CCReg CCReg;
     using VecRegContainer = TheISA::VecRegContainer;
     using VecElem = TheISA::VecElem;
 
@@ -365,7 +364,7 @@ class SimpleExecContext : public ExecContext {
         thread->setVecPredReg(reg, val);
     }
 
-    CCReg
+    RegVal
     readCCRegOperand(const StaticInst *si, int idx) override
     {
         numCCRegReads++;
@@ -375,7 +374,7 @@ class SimpleExecContext : public ExecContext {
     }
 
     void
-    setCCRegOperand(const StaticInst *si, int idx, CCReg val) override
+    setCCRegOperand(const StaticInst *si, int idx, RegVal val) override
     {
         numCCRegWrites++;
         const RegId& reg = si->destRegIdx(idx);