cl: fix wrong global variable type patching

[cpunion]

Fix wrong sync.Mutex size that cause crashes on linux.

Fix #1001

Before:

; linux
%sync.Mutex = type { i32, i32 }
@testing.matchMutex = global %sync.Mutex zeroinitializer, align 4

; macos
%sync.Mutex = type { i64, [56 x i8] }
@testing.matchMutex = global %sync.Mutex zeroinitializer, align 8

After:

; linux
@testing.matchMutex = global [48 x i8]

; macos (no changes)
%sync.Mutex = type { i64, [56 x i8] }
@testing.matchMutex = global %sync.Mutex zeroinitializer, align 8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.33%. Comparing base (51755b8) to head (d8e782f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1002      +/-   ##
==========================================
+ Coverage   89.27%   89.33%   +0.06%     
==========================================
  Files          46       46              
  Lines        8702     8696       -6     
==========================================
  Hits         7769     7769              
+ Misses        761      756       -5     
+ Partials      172      171       -1     

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