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

[Jessica Paquette via cfe-commits]

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@@ -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.
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ornata wrote:

Suggest simplifying the phrasing here.

> By default, Modified Condition/Decision Coverage (MC/DC) instrumentation is limited to 32767 terms. Users may provide their own limit on the number of terms, `n` by passing ``-Xclang -fmcdc-max-conditions=n``.

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