[lld][WebAssembly] -r: force -Bstatic (llvm#108264)

This is a port of a recent ELF linker change: 8cc6a24.

Author: sbc100

lld/test/wasm/libsearch.s

@@ -93,6 +93,11 @@
 // RUN: wasm-ld -pie --experimental-pic --emit-relocs --no-gc-sections -o %t3 %t.o -L%t.dir -Bstatic -call_shared -lls
 // RUN: llvm-readobj --symbols %t3 | FileCheck --check-prefix=DYNAMIC %s
 
+/// -r implies -Bstatic and has precedence over -Bdynamic.
+// RUN: wasm-ld -r -Bdynamic %t.o -L%t.dir -lls -o %t3.ro
+// RUN: llvm-readobj -s -h %t3.ro | FileCheck --check-prefix=RELOCATABLE %s
+// RELOCATABLE: Name: _static
+
 .globl _start, _bar
 _start:
   .functype _start () -> ()

lld/wasm/Driver.cpp

@@ -406,7 +406,8 @@ void LinkerDriver::createFiles(opt::InputArgList &args) {
       ctx.arg.isStatic = true;
       break;
     case OPT_Bdynamic:
-      ctx.arg.isStatic = false;
+      if (!ctx.arg.relocatable)
+        ctx.arg.isStatic = false;
       break;
     case OPT_whole_archive:
       inWholeArchive = true;