[WebAssembly] Rename memory_size intrinsic to current_memory

This follows the recent renaming in the wasm spec.

llvm-svn: 268255
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
index a72da44..521c664 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
@@ -670,15 +670,15 @@
 
 let Defs = [ARGUMENTS] in {
 
-// Memory size.
-def MEMORY_SIZE_I32 : I<(outs I32:$dst), (ins),
-                        [(set I32:$dst, (int_wasm_memory_size))],
-                        "memory_size\t$dst">,
-                      Requires<[HasAddr32]>;
-def MEMORY_SIZE_I64 : I<(outs I64:$dst), (ins),
-                        [(set I64:$dst, (int_wasm_memory_size))],
-                        "memory_size\t$dst">,
-                      Requires<[HasAddr64]>;
+// Current memory size.
+def CURRENT_MEMORY_I32 : I<(outs I32:$dst), (ins),
+                           [(set I32:$dst, (int_wasm_current_memory))],
+                           "current_memory\t$dst">,
+                         Requires<[HasAddr32]>;
+def CURRENT_MEMORY_I64 : I<(outs I64:$dst), (ins),
+                           [(set I64:$dst, (int_wasm_current_memory))],
+                           "current_memory\t$dst">,
+                         Requires<[HasAddr64]>;
 
 // Grow memory.
 def GROW_MEMORY_I32 : I<(outs), (ins I32:$delta),