Use BlockFrequency type in more places (NFC) (#68266)

The `BlockFrequency` class abstracts `uint64_t` frequency values. Use it
more consistently in various APIs and disable implicit conversion to
make usage more consistent and explicit.

- Use `BlockFrequency Freq` parameter for `setBlockFreq`,
`getProfileCountFromFreq` and `setBlockFreqAndScale` functions.
- Return `BlockFrequency` in `getEntryFreq()` functions.
- While on it change some `const BlockFrequency& Freq` parameters to
plain `BlockFreqency Freq`.
- Mark `BlockFrequency(uint64_t)` constructor as explicit.
- Add missing `BlockFrequency::operator!=`.
- Remove `uint64_t BlockFreqency::getMaxFrequency()`.
- Add `BlockFrequency BlockFrequency::max()` function.

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/unittests/Support/BlockFrequencyTest.cpp b/llvm/unittests/Support/BlockFrequencyTest.cpp
index cf5cf92..d0374b0 100644
--- a/llvm/unittests/Support/BlockFrequencyTest.cpp
+++ b/llvm/unittests/Support/BlockFrequencyTest.cpp
@@ -11,6 +11,7 @@
 #include "llvm/Support/DataTypes.h"
 #include "gtest/gtest.h"
 #include <climits>
+#include <cstdint>
 
 using namespace llvm;
 
@@ -106,12 +107,12 @@ TEST(BlockFrequencyTest, Saturate) {
   Freq /= BranchProbability(1, 2);
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
 
-  Freq = 0x1000000000000000ULL;
+  Freq = BlockFrequency(UINT64_C(0x1000000000000000));
   Freq /= BranchProbability(10000, 170000);
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
 
   // Try to cheat the multiplication overflow check.
-  Freq = 0x00000001f0000001ull;
+  Freq = BlockFrequency(UINT64_C(0x00000001f0000001));
   Freq /= BranchProbability(1000, 0xf000000f);
   EXPECT_EQ(33527736066704712ULL, Freq.getFrequency());
 }