[clang] [llvm] [mlir] [MLIR] Add f8E4M3 IEEE 754 type (PR #97118)

[Maksim Levental via cfe-commits]

================
@@ -136,6 +136,7 @@ static constexpr fltSemantics semIEEEquad = {16383, -16382, 
113, 128};
 static constexpr fltSemantics semFloat8E5M2 = {15, -14, 3, 8};
 static constexpr fltSemantics semFloat8E5M2FNUZ = {
     15, -15, 3, 8, fltNonfiniteBehavior::NanOnly, 
fltNanEncoding::NegativeZero};
+static constexpr fltSemantics semFloat8E4M3 = {7, -6, 4, 8};
----------------
makslevental wrote:

Just sanity checking: this is 

```
maxExponent = 7
minExponent = -6
precision = 4
sizeInBits = 8
```
?

https://github.com/llvm/llvm-project/pull/97118
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