[RISCV][GISel] Restore s32 support for G_ABS on RV64.

This reverts commit 5e6a198.

I was was plannig to remove s32 as a legal type on RV64, but
I'm rethinking that.

Author: topperc

llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp

@@ -466,7 +466,7 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST)
 
   auto &AbsActions = getActionDefinitionsBuilder(G_ABS);
   if (ST.hasStdExtZbb())
-    AbsActions.customFor({sXLen}).minScalar(0, sXLen);
+    AbsActions.customFor({s32, sXLen}).minScalar(0, sXLen);
   AbsActions.lower();
 
   auto &MinMaxActions =

llvm/test/CodeGen/RISCV/GlobalISel/iabs.ll

@@ -108,8 +108,8 @@ define i32 @abs32(i32 %x) {
 ;
 ; RV64ZBB-LABEL: abs32:
 ; RV64ZBB:       # %bb.0:
+; RV64ZBB-NEXT:    negw a1, a0
 ; RV64ZBB-NEXT:    sext.w a0, a0
-; RV64ZBB-NEXT:    neg a1, a0
 ; RV64ZBB-NEXT:    max a0, a0, a1
 ; RV64ZBB-NEXT:    ret
   %abs = tail call i32 @llvm.abs.i32(i32 %x, i1 true)

llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-abs-rv64.mir

@@ -102,9 +102,11 @@ body:             |
     ; RV64ZBB-LABEL: name: abs_i32
     ; RV64ZBB: [[COPY:%[0-9]+]]:_(s64) = COPY $x10
     ; RV64ZBB-NEXT: [[ASSERT_SEXT:%[0-9]+]]:_(s64) = G_ASSERT_SEXT [[COPY]], 32
-    ; RV64ZBB-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 0
-    ; RV64ZBB-NEXT: [[SUB:%[0-9]+]]:_(s64) = G_SUB [[C]], [[ASSERT_SEXT]]
-    ; RV64ZBB-NEXT: [[SMAX:%[0-9]+]]:_(s64) = G_SMAX [[ASSERT_SEXT]], [[SUB]]
+    ; RV64ZBB-NEXT: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[ASSERT_SEXT]](s64)
+    ; RV64ZBB-NEXT: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
+    ; RV64ZBB-NEXT: [[SUB:%[0-9]+]]:_(s32) = G_SUB [[C]], [[TRUNC]]
+    ; RV64ZBB-NEXT: [[SEXT:%[0-9]+]]:_(s64) = G_SEXT [[SUB]](s32)
+    ; RV64ZBB-NEXT: [[SMAX:%[0-9]+]]:_(s64) = G_SMAX [[ASSERT_SEXT]], [[SEXT]]
     ; RV64ZBB-NEXT: [[SEXT_INREG:%[0-9]+]]:_(s64) = G_SEXT_INREG [[SMAX]], 32
     ; RV64ZBB-NEXT: $x10 = COPY [[SEXT_INREG]](s64)
     ; RV64ZBB-NEXT: PseudoRET implicit $x10