[clang] [llvm] [AArch64] Add support for intent to read prefetch intrinsic (PR #179709)

[Jonathan Thackray via cfe-commits]

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@@ -435,6 +435,7 @@ let Requires = [{ {AArch64::FeaturePRFM_SLC} }] in {
 def : PRFM<"pst", 0b10, "slc", 0b11, "keep", 0b0>;
 def : PRFM<"pst", 0b10, "slc", 0b11, "strm", 0b1>;
 }
+def : PRFM<"ir",  0b11, "",    0b00, "",     0b0>;
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jthackray wrote:

Does this require a `let Requires = [{ {AArch64::FeaturePCDPHINT} }] in {` here? 

https://github.com/llvm/llvm-project/pull/179709