[llvm] [LoongArch] Support parsing the `%le_{hi20,add,lo12}_r` modifiers (PR #99485)

[Lu Weining via llvm-commits]

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@@ -1570,6 +1583,21 @@ def PseudoTAIL36 : Pseudo<(outs), (ins GPR:$tmp, bare_symbol:$dst), [],
                           "tail36", "$tmp, $dst">,
                    Requires<[IsLA64]>;
 
+// This is a special case of the ADD_W/D instruction used to facilitate the use
+// of a fourth operand to emit a relocation on a symbol relating to this
+// instruction. The relocation does not affect any bits of the instruction itself
+// but is used as a hint to the linker.
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0, isCodeGenOnly = 0 in {
+def PseudoAddTPRel_W : Pseudo<(outs GPR:$rd),
+                             (ins GPR:$rj, GPR:$rk, tprel_add_symbol:$sym), [],
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SixWeining wrote:

nit: `(ins` could be indented to `(outs`

https://github.com/llvm/llvm-project/pull/99485