adjust runtime page size APIs

* fix merge conflicts
* rename the declarations
* reword documentation
* extract FixedBufferAllocator to separate file
* take advantage of locals
* remove the assertion about max alignment in Allocator API, leaving it
  Allocator implementation defined
* fix non-inline function call in start logic

The GeneralPurposeAllocator implementation is totally broken because it
uses global state but I didn't address that in this commit.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/std/debug/MemoryAccessor.zig b/lib/std/debug/MemoryAccessor.zig
index 8c9c93b52e..7857656554 100644
--- a/lib/std/debug/MemoryAccessor.zig
+++ b/lib/std/debug/MemoryAccessor.zig
@@ -7,7 +7,7 @@ const native_os = builtin.os.tag;
 const std = @import("../std.zig");
 const posix = std.posix;
 const File = std.fs.File;
-const min_page_size = std.heap.min_page_size;
+const page_size_min = std.heap.page_size_min;
 
 const MemoryAccessor = @This();
 
@@ -96,7 +96,7 @@ pub fn isValidMemory(address: usize) bool {
     const page_size = std.heap.pageSize();
     const aligned_address = address & ~(page_size - 1);
     if (aligned_address == 0) return false;
-    const aligned_memory = @as([*]align(min_page_size) u8, @ptrFromInt(aligned_address))[0..page_size];
+    const aligned_memory = @as([*]align(page_size_min) u8, @ptrFromInt(aligned_address))[0..page_size];
 
     if (native_os == .windows) {
         const windows = std.os.windows;