Fix 4 of the last 6 remaining macOS-arm64 test/CI failures (#4330)

.cirrus.yml

@@ -41,6 +41,9 @@ common_steps_template: &COMMON_STEPS_TEMPLATE
         rm $CIRRUS_WORKING_DIR/tests/sanitizers/fuzz_basic.d
         # the following 2 have regressed with LLVM 13
         rm $CIRRUS_WORKING_DIR/tests/sanitizers/msan_{noerror,uninitialized}.d
+      elif [[ "$CI_OS-$CI_ARCH" == "osx-arm64" ]]; then
+        # FIXME: LeakSanitizer: CHECK failed: sanitizer_allocator_secondary.h:177 "((IsAligned(reinterpret_cast<uptr>(p), page_size_))) != (0)"
+        rm $CIRRUS_WORKING_DIR/tests/sanitizers/lsan_memleak.d
       fi
       python3 runlit.py -v -j $PARALLELISM .
     run_dmd_testsuite_script: |

tests/dmd/fail_compilation/test15703.d

@@ -1,4 +1,4 @@
-/*
+/* DISABLED: LDC_not_x86 // because of -m32
 REQUIRED_ARGS: -m32
 TEST_OUTPUT:
 ---

tests/dmd/runnable/ldc_extern_weak.d

@@ -5,6 +5,9 @@
 // provided.  extern_weak not really needed on OS X though.
 // REQUIRED_ARGS(osx): -L-undefined -Ldynamic_lookup
 
+// the linker on macOS-arm64 emits a warning
+// TRANSFORM_OUTPUT(osx): remove_lines("warning: -undefined dynamic_lookup may not work with chained fixups")
+
 extern __gshared pragma(LDC_extern_weak) int nonExistent;
 
 bool doesNonExistentExist() {

tests/dmd/runnable_cxx/test22898.d

@@ -4,14 +4,26 @@ import core.stdc.config;
 
 extern(C++):
 
-version (AArch64) version = UnsignedChar;
-version (ARM)     version = UnsignedChar;
-version (RISCV32) version = UnsignedChar;
-version (RISCV64) version = UnsignedChar;
-version (PPC)     version = UnsignedChar;
-version (PPC64)   version = UnsignedChar;
-version (S390)    version = UnsignedChar;
-version (SystemZ) version = UnsignedChar;
+version (OSX)
+    version = Darwin;
+else version (iOS)
+    version = Darwin;
+else version (TVOS)
+    version = Darwin;
+else version (WatchOS)
+    version = Darwin;
+
+version (Darwin) { /* signed on ARM too */ } else
+{
+    version (AArch64) version = UnsignedChar;
+    version (ARM)     version = UnsignedChar;
+    version (RISCV32) version = UnsignedChar;
+    version (RISCV64) version = UnsignedChar;
+    version (PPC)     version = UnsignedChar;
+    version (PPC64)   version = UnsignedChar;
+    version (S390)    version = UnsignedChar;
+    version (SystemZ) version = UnsignedChar;
+}
 
 version (UnsignedChar)
     enum __c_char : ubyte;