[clang] [llvm] [PowerPC] Add support for -mcpu=pwr11 / -mtune=pwr11 (PR #99511)

[Chen Zheng via cfe-commits]

================
@@ -672,6 +685,8 @@ def : ProcessorModel<"pwr7", P7Model, ProcessorFeatures.P7Features>;
 def : ProcessorModel<"pwr8", P8Model, ProcessorFeatures.P8Features>;
 def : ProcessorModel<"pwr9", P9Model, ProcessorFeatures.P9Features>;
 def : ProcessorModel<"pwr10", P10Model, ProcessorFeatures.P10Features>;
+// No scheduler model yet.
----------------
chenzheng1030 wrote:

Is it ok we just use P10Model for P11?

https://github.com/llvm/llvm-project/pull/99511