[WebAssembly] Use wasm-ld rather than lld with -flavor in tests. NFC.

[ruiu]

LGTM

lld/trunk/test/wasm/fatal-warnings.ll

 ; RUN: llc -filetype=obj %s -o %t.main.o
 ; RUN: llc -filetype=obj %p/Inputs/ret32.ll -o %t.ret32.o
-; RUN: lld -flavor wasm -o %t.wasm %t.main.o %t.ret32.o 2>&1 | FileCheck %s -check-prefix=CHECK-WARN
-; RUN: not lld -flavor wasm --fatal-warnings -o %t.wasm %t.main.o %t.ret32.o 2>&1 | FileCheck %s -check-prefix=CHECK-FATAL
+; RUN: wasm-ld -o %t.wasm %t.main.o %t.ret32.o 2>&1 | FileCheck %s -check-prefix=CHECK-WARN
+; RUN: not wasm-ld --fatal-warnings -o %t.wasm %t.main.o %t.ret32.o 2>&1 | FileCheck %s -check-prefix=CHECK-FATAL
 
 ; CHECK-WARN: warning: function signature mismatch: ret32
 ; CHECK-FATAL: error: function signature mismatch: ret32
 
 target triple = "wasm32-unknown-unknown"
 
 define hidden void @_start() local_unnamed_addr #0 {
 entry:
   %call = tail call i32 @ret32(i32 1, i64 2, i32 3) #2
   ret void
 }
 
 declare i32 @ret32(i32, i64, i32) local_unnamed_addr #1

lld/trunk/test/wasm/lto/opt-level.ll

 ; RUN: llvm-as -o %t.o %s
 ; RUN: wasm-ld -o %t0 -e main --lto-O0 %t.o
 ; RUN: obj2yaml %t0 | FileCheck --check-prefix=CHECK-O0 %s
 ; RUN: wasm-ld -o %t2 -e main --lto-O2 %t.o
 ; RUN: obj2yaml %t2 | FileCheck --check-prefix=CHECK-O2 %s
 ; RUN: wasm-ld -o %t2a -e main %t.o
 ; RUN: obj2yaml %t2a | FileCheck --check-prefix=CHECK-O2 %s
 
 ; Reject invalid optimization levels.
-; RUN: not ld.lld -o %t3 -e main --lto-O6 %t.o 2>&1 | \
+; RUN: not wasm-ld -o %t3 -e main --lto-O6 %t.o 2>&1 | \
 ; RUN:   FileCheck --check-prefix=INVALID %s
 ; INVALID: invalid optimization level for LTO: 6
 
-; RUN: not ld.lld -o %t3 -m elf_x86_64 -e main --lto-O-1 %t.o 2>&1 | \
+; RUN: not wasm-ld -o %t3 -m elf_x86_64 -e main --lto-O-1 %t.o 2>&1 | \
 ; RUN:   FileCheck --check-prefix=INVALIDNEGATIVE %s
 ; INVALIDNEGATIVE: invalid optimization level for LTO: 4294967295
 
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
 target triple = "wasm32-unknown-unknown-wasm"
 
 ; CHECK-O0: Name: foo
 ; CHECK-O2-NOT: Name: foo
 define internal void @foo() {
   ret void
 }
 
 define void @main() {
   call void @foo()
   ret void
 }