fix(ci): MachO test buffer overflow + ClockTick on MSVC

Two failures surfaced when the previously-unpushed history reached the
mirror CI for the first time:

- Tests/Std/MachO.c: test_mh1_tab_end_addition sized its scaffold buffer
  u8 b[0x200] (512) but the layout's BUF reaches 544 (stroff 512 +
  strsize + slack), so b[stroff] and the trailing MemCopy ran one region
  past the array -- a UBSan/ASan out-of-bounds. Enlarge to 0x300.

- ClockTick(): the GNU statement-expression + inline-asm form does not
  compile under real MSVC (cl.exe). Add an _MSC_VER (non-clang) branch
  using the __rdtsc() / _ReadStatusReg intrinsic; clang-cl keeps the GNU
  path.

Author: brightprogrammer

Include/Misra/Sys/Clock.h

@@ -42,7 +42,16 @@
 ///
 u64 ClockMonoNs(void);
 
-#if ARCHITECTURE_X86_64
+#if defined(_MSC_VER) && !defined(__clang__)
+// Real MSVC (cl.exe) has no GNU statement-expressions / inline asm; use the
+// compiler intrinsic. clang-cl defines __clang__ and takes the GNU path below.
+#    include <intrin.h>
+#    if ARCHITECTURE_AARCH64
+#        define ClockTick() ((u64)_ReadStatusReg(ARM64_CNTVCT))
+#    else
+#        define ClockTick() ((u64)__rdtsc())
+#    endif
+#elif ARCHITECTURE_X86_64
 #    define ClockTick()                                                                                                \
         (__extension__({                                                                                               \
             u32 tsc_lo_, tsc_hi_;                                                                                      \

Tests/Std/MachO.c

@@ -822,7 +822,7 @@ bool test_mh1_tab_end_addition(void) {
     u32 stroff  = symoff + tab_len;   // strtab right after table
     u32 strsize = 16;
     u32 BUF     = stroff + strsize + 16;
-    u8  b[0x200];
+    u8  b[0x300];                     // must cover BUF (=544 here); 0x200 overflowed
     MemSet(b, 0, sizeof(b));
     SymCfg cfg = {.buf_size = BUF, .symoff = symoff, .nsyms = NSY, .stroff = stroff, .strsize = strsize};
     build_scaffold(b, &cfg);