[llvm] Intrinsic: introduce minimumnum and maximumnum for IR and SelectionDAG (PR #96649)

[Matt Arsenault via llvm-commits]

================
@@ -16101,6 +16101,96 @@ The returned value is completely identical to the input except for the sign bit;
 in particular, if the input is a NaN, then the quiet/signaling bit and payload
 are perfectly preserved.
 
+.. _i_fminmax_family:
+
+'``llvm.min.*``' Intrinsics Comparation
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Standard:
+"""""""""
+
+IEEE754 and ISO C define some min/max operations, and they have some differences
+on working with qNaN/sNaN and +0.0/-0.0. Here is the list:
+
+.. list-table::
+   :header-rows: 2
+
+   * - ``ISO C``
+     - fmin/fmax
+     - fmininum/fmaximum
+     - fminimum_num/fmaximum_num
+
+   * - ``IEEE754``
+     - minNum/maxNum (2008)
+     - minimum/maximum (2019)
+     - minimumNumber/maximumNumber (2019)
+
+   * - ``+0.0 vs -0.0``
+     - either one
+     - +0.0 > -0.0
+     - +0.0 > -0.0
+
+   * - ``NUM vs sNaN``
+     - qNaN, invalid exception
+     - qNaN, invalid exception
+     - NUM, invalid exception
+
+   * - ``qNaN vs sNaN``
+     - qNaN, invalid exception
+     - qNaN, invalid exception
+     - qNaN, invalid exception
+
+   * - ``NUM vs qNaN``
+     - NUM, no exception
+     - qNaN, no exception
+     - NUM, no exception
+
+LLVM Implementation:
+""""""""""""""""""""
+
+LLVM implements all ISO C flavors as listed in this table.
+Only basic intrinsics list here. The constrained version
+ones may have different behaivor on exception.
----------------
arsenm wrote:

```suggestion
LLVM implements all ISO C flavors as listed in this table, except in the default floating-point environment exceptions are ignored. The constrained versions of the intrinsics respect the exception behavior. 

```

https://github.com/llvm/llvm-project/pull/96649