[AMDGPU] Move SIEncodingFamily into SIDefines.h. NFC.

I need this for future patch in the MC, while TII is not available
in the llvm-mc. Besides this is not a first time I want it there.

Differential Revision: https://reviews.llvm.org/D155228

Author: rampitec

llvm/lib/Target/AMDGPU/SIDefines.h

@@ -29,6 +29,24 @@ enum SIRCFlags : uint8_t {
   RegKindMask = (HasVGPR | HasAGPR | HasSGPR)
 }; // enum SIRCFlagsr
 
+namespace SIEncodingFamily {
+// This must be kept in sync with the SIEncodingFamily class in SIInstrInfo.td
+// and the columns of the getMCOpcodeGen table.
+enum {
+  SI = 0,
+  VI = 1,
+  SDWA = 2,
+  SDWA9 = 3,
+  GFX80 = 4,
+  GFX9 = 5,
+  GFX10 = 6,
+  SDWA10 = 7,
+  GFX90A = 8,
+  GFX940 = 9,
+  GFX11 = 10,
+};
+}
+
 namespace SIInstrFlags {
 // This needs to be kept in sync with the field bits in InstSI.
 enum : uint64_t {

llvm/lib/Target/AMDGPU/SIInstrInfo.cpp

@@ -8240,23 +8240,7 @@ SIInstrInfo::splitFlatOffset(int64_t COffsetVal, unsigned AddrSpace,
   return {ImmField, RemainderOffset};
 }
 
-// This must be kept in sync with the SIEncodingFamily class in SIInstrInfo.td
-// and the columns of the getMCOpcodeGen table.
-enum SIEncodingFamily {
-  SI = 0,
-  VI = 1,
-  SDWA = 2,
-  SDWA9 = 3,
-  GFX80 = 4,
-  GFX9 = 5,
-  GFX10 = 6,
-  SDWA10 = 7,
-  GFX90A = 8,
-  GFX940 = 9,
-  GFX11 = 10,
-};
-
-static SIEncodingFamily subtargetEncodingFamily(const GCNSubtarget &ST) {
+static unsigned subtargetEncodingFamily(const GCNSubtarget &ST) {
   switch (ST.getGeneration()) {
   default:
     break;
@@ -8295,7 +8279,7 @@ bool SIInstrInfo::isAsmOnlyOpcode(int MCOp) const {
 }
 
 int SIInstrInfo::pseudoToMCOpcode(int Opcode) const {
-  SIEncodingFamily Gen = subtargetEncodingFamily(ST);
+  unsigned Gen = subtargetEncodingFamily(ST);
 
   if ((get(Opcode).TSFlags & SIInstrFlags::renamedInGFX9) != 0 &&
     ST.getGeneration() == AMDGPUSubtarget::GFX9)