[llvm] [PowerPC] Support local-dynamic TLS relocation on AIX (PR #66316)

[Kai Luo via llvm-commits]

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@@ -660,14 +671,15 @@ void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
          "GETtls[ld]ADDR[32] must read GPR3");
 
   if (Subtarget->isAIXABI()) {
-    // On AIX, the variable offset should already be in R4 and the region handle
-    // should already be in R3.
-    // For TLSGD, which currently is the only supported access model, we only
-    // need to generate an absolute branch to .__tls_get_addr.
+    // On AIX, for TLSGD the variable offset should already be in R4 and the
+    // region handle should already be in R3, need to generate an absolute
+    // branch to .__tls_get_addr. For TLSLD the module handle should already be
+    // in R3, need to generate branch to .__tls_get_mod.
     Register VarOffsetReg = Subtarget->isPPC64() ? PPC::X4 : PPC::R4;
     (void)VarOffsetReg;
-    assert(MI->getOperand(2).isReg() &&
-           MI->getOperand(2).getReg() == VarOffsetReg &&
+    assert((MI->getNumExplicitOperands() < 3 ||
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bzEq wrote:

Added assert condition should be separated since the original assertion message is for `__tls_get_addr`.

https://github.com/llvm/llvm-project/pull/66316