[clang] [llvm] Implement operand bundles for floating-point operations (PR #109798)

[Serge Pavlov via cfe-commits]

================
@@ -2994,6 +2994,29 @@ A "convergencectrl" operand bundle is only valid on a ``convergent`` operation.
 When present, the operand bundle must contain exactly one value of token type.
 See the :doc:`ConvergentOperations` document for details.
 
+.. _ob_fpe:
+
+Floating-point Environment Operand Bundles
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+These operand bundles provide details on how the operation interacts with the
+:ref:`floating-point environment <_floatenv>`. There are two kinds of such
+operand bundles, which characterize interaction with floating-point control
+modes and status bits.
+
+An operand bundle tagged with "fpe.round" may be associated with the operations
+that may depend on rounding mode. It has an integer value, which represents
----------------
spavloff wrote:

I am working on using metadata for these bundles.

https://github.com/llvm/llvm-project/pull/109798