[RISCV] Mark FLH as canFoldAsLoad.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td

@@ -90,6 +90,7 @@ defvar ZfhminDExts = [ZfhminDExt, ZhinxminZdinxExt, ZhinxminZdinx32Ext];
 //===----------------------------------------------------------------------===//
 
 let Predicates = [HasHalfFPLoadStoreMove] in {
+let canFoldAsLoad = 1 in
 def FLH : FPLoad_r<0b001, "flh", FPR16, WriteFLD16>;
 
 // Operands for stores are in the order srcreg, base, offset rather than

llvm/test/CodeGen/RISCV/rv64-stackmap-fp.ll

@@ -15,7 +15,7 @@
 
 ; Functions and stack size
 ; CHECK-NEXT:   .quad   liveArgs
-; CHECK-NEXT:   .quad   16
+; CHECK-NEXT:   .quad   0
 ; CHECK-NEXT:   .quad   1
 
 ; Spilled stack map values.