[lld][WebAssembly] Add LTO test for -mllvm -mcpu=. NFC (llvm#165170)

Author: sbc100

lld/test/wasm/lto/cpu-string.ll

@@ -0,0 +1,27 @@
+; RUN: llvm-as %s -o %t.o
+
+; RUN: wasm-ld %t.o -o %t.wasm
+; RUN: obj2yaml %t.wasm | FileCheck %s
+
+; CHECK: bulk-memory
+; CHECK-NOT: multimemory
+
+; RUN: wasm-ld -mllvm -mcpu=mvp %t.o -o %t.mvp.wasm
+; RUN: obj2yaml %t.mvp.wasm | FileCheck --check-prefix=CHECK-MVP %s
+
+; CHECK-MVP-NOT: bulk-memory
+; CHECK-MVP-NOT: multimemory
+
+; RUN: wasm-ld -mllvm -mcpu=bleeding-edge %t.o -o %t.mvp.wasm
+; RUN: obj2yaml %t.mvp.wasm | FileCheck --check-prefix=CHECK-BLEEDING-EDGE %s
+
+; CHECK-BLEEDING-EDGE: bulk-memory
+; CHECK-BLEEDING-EDGE: multimemory
+
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target triple = "wasm32-unknown-unknown"
+
+define void @_start() #0 {
+entry:
+  ret void
+}