[BOLT][AArch64] Fix CI alignment

[yota9]

Summary

Fix alignment calculation for CI.

[maksfb]

For posterity: test case is in D159543.

[maksfb]

LGTM

bolt/lib/Passes/Aligner.cpp

void AlignerPass::runOnFunctions(BinaryContext &BC) {
 
   AlignHistogram.resize(opts::BlockAlignment);
 
   ParallelUtilities::WorkFuncTy WorkFun = [&](BinaryFunction &BF) {
     // Create a separate MCCodeEmitter to allow lock free execution
     BinaryContext::IndependentCodeEmitter Emitter =
         BC.createIndependentMCCodeEmitter();
 
-    if (opts::UseCompactAligner)
-      alignCompact(BF, Emitter.MCE.get());
-    else
-      alignMaxBytes(BF);
-
     // Align objects that contains constant islands and no code
     // to at least 8 bytes.
     if (!BF.size() && BF.hasIslandsInfo()) {
-      const uint16_t Alignment = BF.getConstantIslandAlignment();
-      if (BF.getAlignment() < Alignment)
-        BF.setAlignment(Alignment);
+      uint16_t Alignment = BF.getConstantIslandAlignment();
+      // Check if we're forcing output alignment and it is greater than minimal
+      // CI required one
+      if (!opts::UseCompactAligner && Alignment < opts::AlignFunctions &&
+          opts::AlignFunctions <= opts::AlignFunctionsMaxBytes)
+        Alignment = opts::AlignFunctions;
 
-      if (BF.getMaxAlignmentBytes() < Alignment)
-        BF.setMaxAlignmentBytes(Alignment);
-
-      if (BF.getMaxColdAlignmentBytes() < Alignment)
-        BF.setMaxColdAlignmentBytes(Alignment);
+      BF.setAlignment(Alignment);
+      return;
     }
 
+    if (opts::UseCompactAligner)
+      alignCompact(BF, Emitter.MCE.get());
+    else
+      alignMaxBytes(BF);
+
     if (opts::AlignBlocks && !opts::PreserveBlocksAlignment)
       alignBlocks(BF, Emitter.MCE.get());
   };
 
   ParallelUtilities::runOnEachFunction(
       BC, ParallelUtilities::SchedulingPolicy::SP_TRIVIAL, WorkFun,
       ParallelUtilities::PredicateTy(nullptr), "AlignerPass");