[clang] [llvm] [MC/DC][Coverage] Loosen the limit of NumConds from 6 (PR #82448)

[NAKAMURA Takumi via cfe-commits]

================
@@ -484,10 +484,31 @@ MC/DC Instrumentation
 ---------------------
 
 When instrumenting for Modified Condition/Decision Coverage (MC/DC) using the
-clang option ``-fcoverage-mcdc``, users are limited to at most **six** leaf-level
-conditions in a boolean expression.  A warning will be generated for boolean
-expressions that contain more than six, and they will not be instrumented for
-MC/DC.
+clang option ``-fcoverage-mcdc``, there are two hard limits.
+
+The maximum number of terms is limited to 32767, which is practical for
+handwritten expressions. To be more restrictive in order to enforce coding rules,
+use ``-Xclang -fmcdc-max-conditions=n``. Expressions with exceeded condition
+counts ``n`` will generate warnings.
----------------
chapuni wrote:

Done.

https://github.com/llvm/llvm-project/pull/82448