[docs] Mention in release notes that we now support 2^32 alignment

Missed in D110451.

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D111472

clang/docs/ReleaseNotes.rst

@@ -121,6 +121,7 @@ C Language Changes in Clang
   `P2362 <wg21.link/P2362>`_.
 - Support for ``__attribute__((error("")))`` and
   ``__attribute__((warning("")))`` function attributes have been added.
+- The maximum allowed alignment has been increased from 2^29 to 2^32.
 
 C++ Language Changes in Clang
 -----------------------------

llvm/docs/LangRef.rst

@@ -709,7 +709,7 @@ to over-align the global if the global has an assigned section. In this
 case, the extra alignment could be observable: for example, code could
 assume that the globals are densely packed in their section and try to
 iterate over them as an array, alignment padding would break this
-iteration. The maximum alignment is ``1 << 29``.
+iteration. The maximum alignment is ``1 << 32``.
 
 For global variables declarations, as well as definitions that may be
 replaced at link time (``linkonce``, ``weak``, ``extern_weak`` and ``common``
@@ -9736,7 +9736,7 @@ appropriate type to the program. If "NumElements" is specified, it is
 the number of elements allocated, otherwise "NumElements" is defaulted
 to be one. If a constant alignment is specified, the value result of the
 allocation is guaranteed to be aligned to at least that boundary. The
-alignment may not be greater than ``1 << 29``. If not specified, or if
+alignment may not be greater than ``1 << 32``. If not specified, or if
 zero, the target can choose to align the allocation on any convenient
 boundary compatible with the type.
 
@@ -9826,7 +9826,7 @@ alignment for the target. It is the responsibility of the code emitter
 to ensure that the alignment information is correct. Overestimating the
 alignment results in undefined behavior. Underestimating the alignment
 may produce less efficient code. An alignment of 1 is always safe. The
-maximum possible alignment is ``1 << 29``. An alignment value higher
+maximum possible alignment is ``1 << 32``. An alignment value higher
 than the size of the loaded type implies memory up to the alignment
 value bytes can be safely loaded without trapping in the default
 address space. Access of the high bytes can interfere with debugging
@@ -9961,7 +9961,7 @@ alignment for the target. It is the responsibility of the code emitter
 to ensure that the alignment information is correct. Overestimating the
 alignment results in undefined behavior. Underestimating the
 alignment may produce less efficient code. An alignment of 1 is always
-safe. The maximum possible alignment is ``1 << 29``. An alignment
+safe. The maximum possible alignment is ``1 << 32``. An alignment
 value higher than the size of the stored type implies memory up to the
 alignment value bytes can be stored to without trapping in the default
 address space. Storing to the higher bytes however may result in data

llvm/docs/ReleaseNotes.rst

@@ -60,6 +60,7 @@ Changes to the LLVM IR
   will be removed after LLVM 14. In the meantime, only minimal effort will be
   made to maintain the legacy pass manager for the optimization pipeline.
 * Max allowed integer type was reduced from 2^24-1 bits to 2^23 bits.
+* Max allowed alignment was increased from 2^29 to 2^32.
 
 Changes to building LLVM
 ------------------------