[Driver] Work around lld 13+ issue with --gc-sections for ELF by addi…

…ng -z nostart-stop-gc (swiftlang#60544)

Fixes swiftlang#60406 

Ran the linux x86_64 compiler validation suite on this pull with `-use-ld=lld -Xlinker --gc-sections`, then without stripping as in the linked issue, and only saw the 20 unrelated failures just like @drodriguez had.

lib/Driver/UnixToolChains.cpp

@@ -184,6 +184,17 @@ toolchains::GenericUnix::constructInvocation(const DynamicLinkJobAction &job,
 #else
     Arguments.push_back(context.Args.MakeArgString("-fuse-ld=" + Linker));
 #endif
+    // Starting with lld 13, Swift stopped working with the lld --gc-sections
+    // implementation for ELF, unless -z nostart-stop-gc is also passed to lld:
+    //
+    // https://reviews.llvm.org/D96914
+    if (Linker == "lld" || (Linker.length() > 5 &&
+                            Linker.substr(Linker.length() - 6) == "ld.lld")) {
+      Arguments.push_back("-Xlinker");
+      Arguments.push_back("-z");
+      Arguments.push_back("-Xlinker");
+      Arguments.push_back("nostart-stop-gc");
+    }
   }
 
   // Configure the toolchain.

test/Driver/link-time-opt.swift

@@ -16,6 +16,7 @@
 // CHECK-SIMPLE-THIN-linux-gnu: clang
 // CHECK-SIMPLE-THIN-linux-gnu-DAG: -flto=thin
 // CHECK-SIMPLE-THIN-linux-gnu-DAG: -fuse-ld=lld
+// CHECK-SIMPLE-THIN-linux-gnu-DAG: -Xlinker -z -Xlinker nostart-stop-gc
 // CHECK-SIMPLE-THIN-linux-gnu-DAG: [[BITCODEFILE]]
 // CHECK-SIMPLE-THIN-linux-gnu-NOT: swift-autolink-extract
 
@@ -37,6 +38,7 @@
 // CHECK-SIMPLE-FULL-linux-gnu: clang
 // CHECK-SIMPLE-FULL-linux-gnu-DAG: -flto=full
 // CHECK-SIMPLE-FULL-linux-gnu-DAG: -fuse-ld=lld
+// CHECK-SIMPLE-FULL-linux-gnu-DAG: -Xlinker -z -Xlinker nostart-stop-gc
 // CHECK-SIMPLE-FULL-linux-gnu-DAG: [[BITCODEFILE]]
 // CHECK-SIMPLE-FULL-linux-gnu-NOT: swift-autolink-extract